Hmm... the DXG is having problems with several of my PDFs. Some bring it to a grinding near halt, one shows as a single page (blank) document rather than a 500 page book and others are fine. The PDF that basically crashes the Kindle offered a font size change option, while the ones that don't crash it have only zoom. Looks like the font size change is the by-product of a bug and not a feature. The way things are going, it's going to take a while to work through the PDF feature. But zoom is definitely a feature and not a bug .